Trial Operation Procedures
4-
11
If the values of E2-02 and E2-03 differed greatly from the reference data of the motor in the test report or the
instruction manual, hunting, motor vibrations, insufficient motor torque, or an overcurrent may occur because
the motor is operated although the aforementioned conditions have not been fulfilled after stationary
autotuning1. For elevators, failure to observe this caution may result in the cage falling or injury. If so, per-
form stationary autotuning1 again and run the motor using the aforementioned procedure under the recom-
mended conditions or perform stationary autotuning 2 or rotational autotuning.
Usually the standard setting for E2-02 is 1 Hz to 3 Hz, and that for E2-03 is 30% to 65% of the rated current
for a general-purpose motor. Generally, the larger the motor capacity is, the smaller the rated slip and the ratio
of the no-load current to the rated current become. Use the data given in
Factory Settings that Change with
the Inverter Capacity (o2-04)
of
Chapter 5 User Constants
as a reference.
Stationary Autotuning for Line-to-Line Resistance Only (T1-01 = 2)
Stationary autotuning for line-to-line resistance only can be used in any control method. This is the only
autotuning possible for V/f control and V/f control with PG modes.
Autotuning can be used to prevent control errors when the motor cable is long (50 m or longer) or the cable
length has changed since installation or when the motor and Inverter have different capacities.
Set T1-01 to 2, and then press the RUN Key on the Digital Operator. The Inverter will supply power to the sta-
tionary motor for approximately 20 seconds and the Motor Line-to-Line Resistance (E2-05) and cable resis-
tance will be automatically measured.
Stationary autotuning 2 is used for open-loop vector control and flux vector control. Set T1-04 to 4, and Motor
no-load current (T1-09) will be added as a setting item. Input the data from the nameplate. Be sure to input the
value or motor no-load current (motor exciting current) from motor examination results to T1-09. After
autotuning, the value of T1-09 will be written in E1-03. When not setting T1-09, the value of Yaskawa stan-
dard motor’s no-load current will be written in E1-03.
Precautions for Rotational and Stationary Autotuning
Lower the base voltage based on
Fig 4.4
to prevent saturation of the Inverter’s output voltage when the rated
voltage of the motor is higher than the voltage of the power supply to the Inverter. Use the following proce-
dure to perform autotuning.
1. Input the voltage of the input power supply to T1-03 (Motor rated voltage).
2. Input the results of the following formula to T1-05 (Motor base frequency):
(Base frequency from the motor’s nameplate
×
setting of T1-03)/(Rated voltage from motor’s nameplate)
3. Perform autotuning.
IMPORTANT
1. Power will be supplied to the motor when stationary autotuning 1 is performed even though the motor
will not turn. Do not touch the motor until autotuning has been completed.
2. When performing stationary autotuning 1 connected to a conveyor or other machine, ensure that the
holding brake is not activated during autotuning.
IMPORTANT
1. Power will be supplied to the motor when stationary autotuning for line-to-line resistance is performed
even though the motor will not turn. Do not touch the motor until autotuning has been completed.
2. When performing stationary autotuning connected to a conveyor or other machine, ensure that the
holding brake is not activated during autotuning.
IMPORTANT
1. Power will be supplied to the motor when stationary autotuning 2 is performed even though the motor
will not turn. Do not touch the motor until autotuning has been completed.
2. When performing stationary autotuning 2 connected to a conveyor or other machine, ensure that the
holding brake is not activated during autotuning.
Stationary Autotuning 2 (T1-01
=
4)
